Seekonk Sport Trucks (SST) 2015
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Seekonk Sport Trucks (SST) 2015 Official Rules 1.0 General Specifications NOTICE: When used in the rules, the term “stock” includes after-market products. Stock components must conform to original equipment manufacturer specifications. No alterations from stock components unless specifically provided for in the rules. 1.1 PICKUP (COMPACT) TRUCKS: manufactured from 1982 to 2002 with a maximum wheelbase of 108 inches. 4WD or any type extended cabs or long beds are not permitted. Eligible chassis: Ford Ranger - Chevy S10 - GMC Sonoma - Nissan Hard body - Toyota Tacoma 1.2 ROLL CAGE: Roll cage must have a four point symmetrical structure fully extended from left to right connecting to the side rail kickouts using minimum 1-3/4" O.D. seamless steel tubing with a .090" wall thickness. Side rail kick outs must be 2" wide by 3" high steel box tubing of equal length with a .120" wall thickness and must connect from front to back forming an outside frame rail. Kick-out tubing connectors to frame rails must be 2" x 3" and of equal length on each side, no less than .083" wall thickness. No holes may be made in the frame rails, connectors, or any part of the original truck’s frame within the roll cage area. Offset to roll cage is not permitted. Top halo bar (above driver’s head) cannot be offset. Halo must follow closely to the roof outline. Roof halo bar must have a minimum of one full cross bar. Minimum of three (full-length) door bars located in right side door area required. These bars may be .065-inch wall thickness. Four horizontal door bars are required on driver's side with a minimum of two vertical bars connecting each horizontal bar, for a minimum of six (6). The top horizontal door bar on each side of the roll cage must have a minimum height of 21" from top of chassis to top of bar. The placement of left side driver support plates is mandatory. Solid steel plates of 0.125-inch (1/8”) must be either inside, outside or between horizontal door bars. Door plates must be bolted or welded in place. Vertical vent window bars must be welded from the top of the door bars to the side of front roll bar legs. Roll bars may extend to front of chassis. Only 2 roll bars may connect at top of rear hoop behind the driver, down to chassis, min. 1 3/4" tubing. NO OTHER BARS MAY SHOW ABOVE TOP OF BED. 1.3 SEAT: MUST BE BOLTED TO A SUB-FRAME ATTACHED TO THE ROLL CAGE. The following is recommended for racing. Only custom manufactured, HIGH BACK aluminum seats acceptable to track officials. No holes permitted in seats for weight reduction. Back and side supports of seat must be no less than .125" thickness. Bottom and top head support no less than .100." Seats must be securely fastened with four bolts (min. 3/8”) with large washers to the bottom, and two at the top of seat to roll cage. Seat must be located to the inside of main frame rail. Seat must be NO LOWER than 4" measured from the bottom of the stock chassis and inside 2" x 3" frame area fabricated for roll cage. The stock frame may be notched only to lower driver’s seat. All roll bars within driver's reach must be padded. 1.4 SEAT BELTS: It is recommended that the seat belts use a 5-point harness securely fastened to the roll cage or chassis with min. 3/8” bolts. 6-point harness is highly recommended. Belts must be no less than 3" wide. When a HANS head restraint device is used a 2" wide shoulder harness may be used. A quick-release mechanism must be fastened to lap belt. The shoulder harness must be attached to roll bar behind the driver's seat. Y-type shoulder harness is NOT permitted. Where the harness crosses the roll cage, it must pass through a steel guide welded to the roll cage that will prevent the harness from sliding side to side. A center crotch belt (2” min. width) must be used and securely mounted to the lower seat frame. Manufacturer’s date must not exceed (3) three years. Belts with no date or belts that show signs of wear will not be eligible for use. It is recommended that all drivers use some type of head and neck restraint. 1.6 BATTERY & QUICK-DISCONNECT SWITCH: Battery relocation must be behind driver, inside chassis rails. No positive battery cables may be located on outside of roll cage. Switch must be located near center of dash, accessible to driver or safety crew. Switch must be clearly marked On/Off (This switch must totally disconnect the battery from the system) 2.0 Mechanical Rules 4 cyl engine rules All engine components must remain stock unless otherwise noted in the rules. Stock bore and stroke combination must be maintained with a Maximum .040” overbore. Internal polishing, porting, abrasive cleaning, painting or coating of engine parts is not permitted. NO ROTARY or TWIN-CAM ENGINES. No Turbo-chargers or super-chargers. Marine engines are not eligible for use. 4 cylinder eligible engines: Ford-2.3cc, Toyota-2.4cc, Chevy-2.5cc, Nissan-2.4cc 2.1 *CARBURETOR: 4cyl engines have the choice of the Holley 350 cfm #7448 or #80787 or Holley 500 cfm #4412 or #80583. Carburetors may only have listed modifications: Choke butterfly removed, change jets, power valve, accelerator pump cam and discharge nozzles, idle holes in butterflies, air vents enlarged. Choke horn may not be removed. Induction hats, baffles, ducts or dividers “NOT” permitted on or leading to the air cleaner or element. Top of air cleaner must be completely steel or aluminum. No cowl air inductions. Modifications to increase or change airflow “NOT” permitted. Carburetor is subject to inspection with no-go gauges. Only one spacer plate permitted 1 inch maximum height with standard gaskets. Internal walls of spacer must be parallel to each other. No angled holes. *When fiberglass body option is used in its complete form a cowl induction is allowed as part of the body package. 2.2 INTAKE MANIFOLD: Stock or after-market intake manifolds permitted. No porting, polishing, or abrasive cleaning permitted. 2.3 CAMSHAFTS: Any cam lift permitted. Roller camshafts not permitted. After-market rocker arms Allowed. Lifters must be stock diameter for the type engine used. Any style steel valve springs and retainers are permitted. Cam buttons are permitted. 2.4 CYLINDER HEAD: Only stock production permitted. The cylinder head must be completely cast iron or aluminum in stock application. Maximum of two valves per cylinder. The intake and exhaust ports must be in the original "as cast" configuration. Any sanding, polishing, relieving, grinding, porting, chemical treating, abrasive blasting, alterations to the original form, or the addition of materials to the ports or combustion chamber, will be declared illegal. Only stock diameter valves, as used in standard production are permitted. Multi angle valve jobs permitted with the final cut (bottom) no more than 60 degrees and 3/8 inch pass valve seat. All cuts for valve job must be off center of valve guide. No titanium or carbon fiber engine parts permitted. COMPRESSION: Engines must have a maximum static compression ratio of (10.5:1) per each cylinder. Testing will be done with a "WHISTLER" device measuring combustion chamber volume. 2.5 PISTON & RODS: Stock forged steel rods. After-market steel rods are approved. No Billet rods. Rods must be stock configuration to size and appearance. Rod length may be changed. No lightening, beam polishing or exterior machine work allowed, except bob weight removal for balancing. When balancing the rods, one of the four must remain untouched. Rod bolts may be changed. Free floating (steel) wrist pins permitted. Stainless steel connecting rods are not eligible for use. Cast or forged three-ring aluminum pistons only. 2.6 CRANKSHAFT: Stock stroke must be maintained. Only cast or forged steel cranks permitted. No modification to counter weights from stock form. No lightening or "trick" materials. Only Normal balancing permitted. 2.7 IGNITION: Only stock systems permitted. After-market point and hall effect types permitted. No after- market, capacitive discharge, MSD, or multi-spark systems allowed. Module must be stock type. Any coil, cap, rotor, condenser, wires, and spark plugs may be used. No other components permitted other than what's listed above. Only stock starters permitted. Mel’s Distributors permitted. 2.8 OIL SYSTEM: No dry sump systems. No external belt-driven systems. Oil pan may be modified steel only. 2.9 FUEL SYSTEM: Mechanical type preferred. If electric pump is used, it must be mounted under truck, inside main frame rails, and must be hooked up to MASTER shut-off switch with an auto shut-off in case of roll over. 2.10 ENGINE POSITION: 4 cylinder engines (Except Ford with I-beam front end) the maximum set back, #2 spark plug hole must be even or ahead of centerline of top ball joint or king pin. Ford set back #1 spark plug hole, Ford with Mustang front end #2 spark plug. Center of crankshaft to ground is to be no lower than 12-1/2". The engine must be within 1" inch centerline of chassis. 2.11 COOLING SYSTEM: Radiator must remain in standard position. Only belt drive water pumps permitted. Overflow tank mandatory, hose from tank must be positioned at right rear. Electric fans are permitted. Water is the only coolant to be used. 2.12 MUFFLERS: Mandatory muffler rule in effect.